Preah Khan was one of the most important temple cities/complexes in Angkor, built by Jayavarman VII in the late 12th century and dedicated to his father. It was a Buddhist centre of learning, but like many Angkorian temples, both Buddhists and Hindus worshipped here. Its name, meaning the Sacred Sword, alludes to the palladium of the Khmer empire, a recent copy of which is kept in the Royal Palace in Phnom Penh. The site occupies an area of 138 acres northeast of Angkor Thom, along the Grand Circuit. The temple is massive, and can be approached via its east or west entrances. The temple contains countless scuptures and wall carvings, some of which are relatively well-preserved. There is also a small open-air museum displaying some artifacts from the site.